Straight spark plug head

[Frankfort MB's]

what spark plug should I use with my straight up spark plug because my b8hs NGK will not work with my high performance head due to hitting the spark plug

 

[Steve Best]

edit: WHOOPS! Will not work, it is an "E" reach, not and "H"
I use these on my KTM to clear the fuel tank.
I do not think there is a BR8HCM, but it would be what you are looking for.

Denso makes short plugs as well, Denso IWM01-29 was a replacement for the BR8ECM.
Brace yourself for the price!


(Previously posted, NOT VALID)
Use a BR8ECM.
Pricey, but shorter on the top side for more clearance.
The inside the cylinder part is exactly the same.

Steve

 

[Frankfort MB's]

I just read my post and realized I made a mistake in what I said. I need a plug that is shorter because piston is hitting the plug

 

[HeadSmess]

ha ha...shoulda left that one, cus the original post dont make sense anymore...

plain old CJ8 /bmr8hs for lawnmower/brushcutter/most small yard equipment works fine when space is tight.

 

[Frankfort MB's]

Lol sorry not very good at explaining myself when I'm kinda confused on what I'm asking?


I'm using a head that has the spark plug straight up and the tip of the spark plug is hitting the piston

 

[HeadSmess]

its either an E thread length (19mm) or its a P tip(projected).

the cj8 is actually slightly better than the b5Hs as the thread is marginally shorter, about one thread less...

 

[WINDY CITY BOB]

What's best plug for 49cc 2stroke (B5HS) B6HS (B7HS) ? I'm also having a problem with my car when I pull in the clutch it revs really really hiigh

 

[HeadSmess]

its climate dependent. 5 is the best for all round, 7 will tend to foul up/ come out dark brown black unless the engines tuned well and ambient temps are high...

otherwise all the same...


car?

 

[WINDY CITY BOB]

Typo car should be CARB DOHHHHHH!

 

[Steve Best]

What's best plug for 49cc 2stroke (B5HS) B6HS (B7HS) ? I'm also having a problem with my car when I pull in the clutch it revs really really hiigh

You need to learn how the read the heat range on the plug. Read my other threads.
Too low a number is dangerous. Stick with a 7 or 8 or you may burn a hole in a piston.

Your car either has a vacuum leak or the idle valve solenoid is dirty and sticking.
Buy a can of throttle body cleaner to solve both.
Clean the throttle solenoid then hunt for leaks. A small hose will work as a stethoscope.

Steve